package k8s

import (
	"context"
	"fmt"
	"time"

	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/log"
)

// Reconciler represents a Kubernetes resource reconciler
type Reconciler struct {
	client client.Client
	scheme *runtime.Scheme
}

// NewReconciler creates a new reconciler
func NewReconciler(client client.Client, scheme *runtime.Scheme) *Reconciler {
	return &Reconciler{
		client: client,
		scheme: scheme,
	}
}

// StatefulSetReconciler reconciles StatefulSet resources
type StatefulSetReconciler struct {
	*Reconciler
}

// NewStatefulSetReconciler creates a new StatefulSet reconciler
func NewStatefulSetReconciler(client client.Client, scheme *runtime.Scheme) *StatefulSetReconciler {
	return &StatefulSetReconciler{
		Reconciler: NewReconciler(client, scheme),
	}
}

// Reconcile implements reconcile.Reconciler
func (r *StatefulSetReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	return r.ReconcileStatefulSet(ctx, req)
}

// ReconcileStatefulSet reconciles a StatefulSet
func (r *StatefulSetReconciler) ReconcileStatefulSet(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	logger := log.FromContext(ctx)

	var statefulSet appsv1.StatefulSet
	if err := r.client.Get(ctx, req.NamespacedName, &statefulSet); err != nil {
		if errors.IsNotFound(err) {
			logger.Info("StatefulSet not found, skipping reconciliation")
			return ctrl.Result{}, nil
		}
		return ctrl.Result{}, fmt.Errorf("failed to get StatefulSet: %w", err)
	}

	logger.Info("Reconciling StatefulSet", "name", statefulSet.Name, "namespace", statefulSet.Namespace)

	// Generate event for cluster manager
	event := &ResourceEvent{
		Type:      EventTypeStatefulSetChanged,
		Resource:  "StatefulSet",
		Name:      statefulSet.Name,
		Namespace: statefulSet.Namespace,
		Status:    string(statefulSet.Status.ReadyReplicas),
		Labels:    statefulSet.Labels,
		Timestamp: time.Now(),
	}

	// Here you would send the event to the cluster manager
	// For now, we'll just log it
	logger.Info("Generated StatefulSet event", "event", event)

	return ctrl.Result{}, nil
}

// PVCReconciler reconciles PersistentVolumeClaim resources
type PVCReconciler struct {
	*Reconciler
}

// NewPVCReconciler creates a new PVC reconciler
func NewPVCReconciler(client client.Client, scheme *runtime.Scheme) *PVCReconciler {
	return &PVCReconciler{
		Reconciler: NewReconciler(client, scheme),
	}
}

// Reconcile implements reconcile.Reconciler
func (r *PVCReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	return r.ReconcilePVC(ctx, req)
}

// ReconcilePVC reconciles a PersistentVolumeClaim
func (r *PVCReconciler) ReconcilePVC(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	logger := log.FromContext(ctx)

	var pvc corev1.PersistentVolumeClaim
	if err := r.client.Get(ctx, req.NamespacedName, &pvc); err != nil {
		if errors.IsNotFound(err) {
			logger.Info("PVC not found, skipping reconciliation")
			return ctrl.Result{}, nil
		}
		return ctrl.Result{}, fmt.Errorf("failed to get PVC: %w", err)
	}

	logger.Info("Reconciling PVC", "name", pvc.Name, "namespace", pvc.Namespace)

	// Generate event for cluster manager
	event := &ResourceEvent{
		Type:      EventTypePVCChanged,
		Resource:  "PersistentVolumeClaim",
		Name:      pvc.Name,
		Namespace: pvc.Namespace,
		Status:    string(pvc.Status.Phase),
		Labels:    pvc.Labels,
		Timestamp: time.Now(),
	}

	// Here you would send the event to the cluster manager
	// For now, we'll just log it
	logger.Info("Generated PVC event", "event", event)

	return ctrl.Result{}, nil
}

// PVReconciler reconciles PersistentVolume resources
type PVReconciler struct {
	*Reconciler
}

// NewPVReconciler creates a new PV reconciler
func NewPVReconciler(client client.Client, scheme *runtime.Scheme) *PVReconciler {
	return &PVReconciler{
		Reconciler: NewReconciler(client, scheme),
	}
}

// Reconcile implements reconcile.Reconciler
func (r *PVReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	return r.ReconcilePV(ctx, req)
}

// ReconcilePV reconciles a PersistentVolume
func (r *PVReconciler) ReconcilePV(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
	logger := log.FromContext(ctx)

	var pv corev1.PersistentVolume
	if err := r.client.Get(ctx, req.NamespacedName, &pv); err != nil {
		if errors.IsNotFound(err) {
			logger.Info("PV not found, skipping reconciliation")
			return ctrl.Result{}, nil
		}
		return ctrl.Result{}, fmt.Errorf("failed to get PV: %w", err)
	}

	logger.Info("Reconciling PV", "name", pv.Name)

	// Generate event for cluster manager
	event := &ResourceEvent{
		Type:      EventTypePVChanged,
		Resource:  "PersistentVolume",
		Name:      pv.Name,
		Namespace: "", // PVs are cluster-scoped
		Status:    string(pv.Status.Phase),
		Labels:    pv.Labels,
		Timestamp: time.Now(),
	}

	// Here you would send the event to the cluster manager
	// For now, we'll just log it
	logger.Info("Generated PV event", "event", event)

	return ctrl.Result{}, nil
}
